Regulating Balsa Wood Cell Wall Nanostructure via TEMPO Oxidation

WU Mingyue; DAI Xinjian; WANG Xin; WANG Xiaoqing

doi:10.12326/j.2096-9694.2024121

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Regulating Balsa Wood Cell Wall Nanostructure via TEMPO Oxidation
Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China
Vol. 38, Issue 6, Pages: 1-7(2024)
Published： 30 November 2024 ，
DOI： 10.12326/j.2096-9694.2024121
稿件说明：

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WU MINGYUE, DAI XINJIAN, WANG XIN, et al. Regulating Balsa Wood Cell Wall Nanostructure via TEMPO Oxidation. [J]. Chinese journal of wood science and technology, 2024, 38(6): 1-7.
DOI：

WU MINGYUE, DAI XINJIAN, WANG XIN, et al. Regulating Balsa Wood Cell Wall Nanostructure via TEMPO Oxidation. [J]. Chinese journal of wood science and technology, 2024, 38(6): 1-7. DOI： 10.12326/j.2096-9694.2024121.

摘要

针对天然木材细胞壁中纳米孔隙有限及比表面积低的问题，采用2，2，6，6-四甲基哌啶-1-氧自由基（2，2，6，6-tetramethylpiperidinyl-1-oxyl radical，TEMPO）介导氧化法原位疏解轻木（

Ochroma pyramidale

）细胞壁微纤丝束，并结合超临界干燥制备TEMPO氧化木材，以调控木材细胞壁纳米结构并提升其比表面积。采用扫描电镜（SEM）、傅里叶变换红外光谱仪（FTIR）及能量色散能谱仪（EDS）对材料的微观形貌和化学组成进行表征，并结合比表面积及孔隙度分析仪，探究氧化处理对木材细胞壁孔隙结构的影响。结果表明：TEMPO氧化处理保留了木材的蜂窝状细胞结构，并实现了木材细胞壁微纤丝束的原位疏解，使其展现高度纤丝化的纳米网络结构，纤丝直径分布在20～40 nm之间；TEMPO氧化处理木材细胞壁具有丰富的介孔结构，其比表面积高达96.92 m

/g，相比天然木材提升约72倍。研究为木材细胞壁纳米结构调控以及木基多孔材料开发提供新思路。

Abstract

The lack of nanopores and low specific surface area of natural wood limit its functional applications in many fields. In this study

6-tetramethylpiperidinyl-1-oxyl radical (TEMPO)-mediated oxidation was applied to generate nanopores in wood and increase its specific surface area by in-situ fibrillation of cellulose microfibril bundles within the cell walls of balsa wood (

Ochroma pyramidale

). The microstructure and chemical composition of the TEMPO-oxidized wood were characterized using scanning electron microscopy (SEM)

Fourier transform infrared spectroscopy (FTIR)

and energy dispersive spectroscopy (EDS). Moreover

the effect of TEMPO-oxidation treatment on the pore structure of wood cell wall was investigated using a specific surface area and pore size analyzer. The results showed that the honeycomb-like cellular structure of the wood was well preserved after oxidation treatment

while the microfibrils in the wood cell wall were successfully individualized

resulting in a highly nanofibrillated network structure with microfibril diameters ranging from 20 to 40 nm. The TEMPO-oxidized wood exhibited a highly mesoporous structure w

ith a high specific surface area of 96.92 m²/g

which is about 72 times higher than that of natural wood. This study provides a novel approach to regulating the nanostructure of wood cell walls for developing porous wood-based materials.

关键词

轻木细胞壁纳米结构细胞壁孔隙TEMPO氧化纤维素微纤丝

Keywords

balsa woodcell wall nanostructurepore structureTEMPO oxidationcellulose microfibrils

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